Zero landau level in folded graphene nanoribbons

Graphene nanoribbons can be folded into a double layer system keeping the two layers decoupled. In the quantum Hall regime folds behave as a new type of Hall bar edge. We show that the symmetry properties of the zero Landau level in metallic nanoribbons dictate that the zero energy edge states traversing a fold are perfectly transmitted onto the opposite layer. This result is valid irrespective of fold geometry, magnetic field strength, and crystallographic orientation of the nanoribbon. Backscattering suppression on the N=0 Hall plateau is ultimately due to the orthogonality of forward and backward channels, much like in the Klein paradox. © 2010 The American Physical Society.Support from MICINN (Spain), through Grants No. FIS2009-08744 and No. FIS2008-00124.Peer Reviewe

Report on Dynamic Data Reconciliation of Large-Scale Processes

Producción CientíficaAvailability of reliable process information in real time is key in any decision-making procedure. Thus, good industrial decision-support implementations require dealing with gross errors and consideration of process transients in order to get a set of measurements which will be coherent with the basic underlying process dynamics. This report presents dynamic data reconciliation methods and tools adapted to the requirements of industrial environments (large-scale systems and noisy/faulty data). Moreover, basic concepts in literature are extended to artificially increase system redundancy as well as to cope with time-varying parameter estimation. The procedure summarized in this report has been tested in the Lenzing case study.Ingeniería de Sistemas y AutomáticaEuropean Union Horizon 2020 program (grant nº 723575

Sumo, la lucha de los dioses

[ES] El libro de Eduardo de Paz llena por fin un vacío que existía desde siempre en el mercado editorial en lengua hispana y se convierte en un perfecto tratado sobre lo que es y significa el mundo del Sumo para todos aquellos que lo practican y lo siguen con inusitado interés, especialmente para quienes, desde la lejanía, lo vivimos como algo propio

Sumo, la lucha de los dioses

Eduardo de Paz Gútiez. Barcelona: Shinden Ediciones, 2006. 165 páginas. 26x18 cm. I.S.B.N.: 84-933469-5-0

Sumo, la lucha de los dioses

Eduardo de Paz Gútiez. Barcelona: Shinden Ediciones, 2006. 165 páginas. 26x18 cm. I.S.B.N.: 84-933469-5-0

Real-time optimisation for a heat-recovery section with equipment degradation

[Abstract] This work aims to optimise the operation of an industrial heat-recovery section in a fibre-production factory. The section is formed by a network of heat exchangers able to be supplied with different hot sources. The goal is minimising the resource utilisation in real time (the sources usage) while satisfying a set of operational constrains. Hence, problems of economically optimal hot-sources allocation to heat exchangers arise. The problem is formulated and solved via mixed-integer non-linear programming. Furthermore, concerns about the practical implementation and the degradation of the equipment due to the fouling effect are also taken into account in the optimisation. In this way, the decision-support tool not only provides the optimal allocation, but also suggestions on which heat exchangers are potentially beneficial to be clean.Ministerio de Ciencia, Innovación y Universidades; PGC2018-099312-B-C3

Development of a grey model for a medium density fibreboard dryer in ecosimpro

[Abstract] This work contains the design and testing of a greybox model based on first principles for the drying section of a Medium Density Fiberboard (MDF) manufacturing plant for use in a Model-Predictive Controller (MPC).The fitting of the model to experimental data has been solved with the data reconciliation technique, and the model has then been implemented and tested in simulation for proper behavior. Due to lac k of information in a number of relevant process values, as well as low trustworthiness of some measurements,state and disturbance estimators have been determined as necessary to include in the final MPC control schema.Ministerio de Economía y Competitividad; DPI2015-70975-

A systematic grey-box modeling methodology via data reconciliation and SOS constrained regression

Producción CientíficaDeveloping the so-called grey box or hybrid models of limited complexity for process systems is the cornerstone in advanced control and real-time optimization routines. These models must be based on fundamental principles and customized with sub-models obtained from process experimental data. This allows the engineer to transfer the available process knowledge into a model. However, there is still a lack of a flexible but systematic methodology for grey-box modeling which ensures certain coherence of the experimental sub-models with the process physics. This paper proposes such a methodology based in data reconciliation (DR) and polynomial constrained regression. A nonlinear optimization of limited complexity is to be solved in the DR stage, whereas the proposed constrained regression is based in sum-of-squares (SOS) convex programming. It is shown how several desirable features on the polynomial regressors can be naturally enforced in this optimization framework. The goodnesses of the proposed methodology are illustrated through: (1) an academic example and (2) an industrial evaporation plant with real experimental data.Ministerio de Economía, Industria y Competitividad (grant DPI2016-81002-R

Comentario sobre la Matemática Aplicada en España

En el número de Septiembre de 2004 del Boletín del SEMA, los autores publicamos un artículo de opinión sobre la situación de la Matemática Aplicada en España. El objetivo principal del artículo fue mover a la reflexión sobre algunas deficiencias no corregidas y, en algún caso, aumentadas durante los últimos años. Tales deficiencias pueden hipotecar el futuro de la Matemática Aplicada española, e impedir que contribuya de modo eficaz al desarrollo científico y tecnológico del país

La Matemtica Aplicada: entre lo divino y lo humano

España es la décima potencia mundial si consideramos el número de artículos de Matemáticas publicados en un año con un autor español por lo menos .Cuando estos artículos se ponderan con su índice de impacto y se toma la media mundial como cero, el índice español en Matemáticas es 13 . Esta situación es particularmente grave en el área de Matemática Aplicada. Según el informe Andradas-Zuazua (que expurgó los artículos matemáticos aparecidos en revistas relevantes de Física, Mecánica de Medios Continuos, Mecánica de Fluidos, etc. e incluso en la revista SIAM Journal on Applied Mathematics), la revista en que más publican los "matemáticos aplicados" españoles es Proceedings of the American Mathematical Society, una revista que se encuentra año tras año en el último cuarto de la lista de Matemática Aplicada del índice de impacto JCR. Anecdóticamente, la ANECA reconoce esta situación usando baremos más bajos para Matemáticas que para las otras disciplinas científicas